QmlDesigner: Move 3D asset import to puppet

Moved 3D asset import to puppet to ensure import always uses the
correct version of the QtQuick3D.

Fixes: QDS-3154
Change-Id: I630a833e7231383b87bf8b7214d3545d12de15ab
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

share/qtcreator/qml/qmlpuppet/commands/puppettocreatorcommand.h

@@ -34,7 +34,13 @@ namespace QmlDesigner {
 class PuppetToCreatorCommand
 {
 public:
-    enum Type { Edit3DToolState, Render3DView, ActiveSceneChanged, RenderModelNodePreviewImage, None };
+    enum Type {
+        Edit3DToolState,
+        Render3DView,
+        ActiveSceneChanged,
+        RenderModelNodePreviewImage,
+        Import3DSupport,
+        None };
 
     PuppetToCreatorCommand(Type type, const QVariant &data);
     PuppetToCreatorCommand() = default;